a = 'asd'
b = "asd"
c = """asd"""
d = '''asd'''

print('she said:"perfect!"')
print("I'm a good boy")

# python支持转义字符
# \' \" \\ \t \n
print('I\'m a good boy')
# 在str前加r或R，表示python原生字符串
print(r'KK\tK')
#  但r或R只对转义字符有效


